Psion Article released made a mention of Psion class being good for the Githyanki race due to the favoured stat of Intelligence (Githyanki are Int/Con). This confirms Githyanki as a Player Race in PH3!!!
Before posting, why not ask yourself, What Would Wrecan Say? A great man once said "If WotC put out boxes full of free money there'd still be people complaining about how it's folded." – Boraxe